5.3.1.1.Required Resistance to Heat Transfer (See Note A-5.3.1.1.)

(1) Except as provided in Sentence (2), where a building component or assembly will be subjected to an intended
  temperature differential, the component or assembly shall include materials to resist heat transfer or a means to dissipate
  transferred heat in accordance with the remainder of this Subsection.

  (2) The installation of materials to resist heat transfer in accordance with this Subsection is not required where it can be
  shown that uncontrolled heat transfer will not adversely affect any of
  (a) the health or safety of building users,
  (b) the intended use of the building, or
  (c) the operation of building services.

Next →5.3.1.2. Properties to Resist Heat Transfer or Dissipate

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.